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부품번호 | NCP1521 기능 |
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기능 | Adjustable Output Voltage Step-Down Converter | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 17 페이지수
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NCP1521
1.5 MHz, 600 mA,
High−Efficiency, Low
Quiescent Current,
Adjustable Output Voltage
Step−Down Converter
The NCP1521 step−down PWM DC−DC converter is optimized for
portable applications powered from one cell Li−ion or three cell
Alkaline/NiCd/NiMH batteries. The device is available in an adjustable
output voltage from 0.9 V to 3.3 V. It uses synchronous rectification to
increase efficiency and reduce external part count. The device also has a
built−in 1.5 MHz (nominal) oscillator which reduces component size by
allowing a small inductor and capacitors. Automatic switching
PWM/PFM mode offers improved system efficiency.
Finally, it includes an integrated soft−start, cycle−by−cycle current
limiting, and thermal shutdown protection. The NCP1521 is
available in space saving, low profile TSOP5 and UDFN6 packages.
Features
• 95.3% of Efficiency for 3.3 V Output and 4.2 V Input and 80 mA
Load−Current
• Sources up to 600 mA
• 1.5 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 3.3 V
• 30 mA Quiescent Current
• Synchronous Rectification for Higher Efficiency
• 2.7 V to 5.5 V Input Voltage Range
• Thermal Limit Protection
• Shutdown Current Consumption of 0.3 mA
• Short Circuit Protection
• This is a Pb−Free Device
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still/Video Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
• USB Powered Devices
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MARKING
DIAGRAM
5
1
TSOP−5
SN SUFFIX
CASE 483
5
DBPAYWG
G
1
DBP = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
UDFN6
MU SUFFIX
CASE 517AB
16
2 ZCMG 5
3G4
ZC = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping
NCP1521ASNT1G TSOP−5 3000/Tape & Reel
(Pb−Free)
NCP1521AMUTBG UDFN6 3000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
VIN
CIN
OFF ON
1 VIN LX 5
2 GND
3 EN
FB 4
L
COUT
Figure 1. Typical Application − TSOP−5
VOUT
OFF ON
R1 Cff
R2
VIN
1 EN FB 6
2 GND LX 5
R2
2.2 mH R1
3 VIN GND 4
4.7 mF
18 pF
VOUT
10 mF
Figure 2. Typical Application − UDFN6
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
NCP1521/D
NCP1521
ELECTRICAL CHARACTERISTICS (Typical values are referenced to TA = +25°C, Min and Max values are referenced −40°C to
+85°C ambient temperature, unless otherwise noted, operating conditions VIN = 3.6 V, VOUT = 1.8 V, unless otherwise noted.)
Characteristic
Symbol
Min Typ Max Unit
Input Voltage Range
Undervoltage Lockout (VIN Falling)
Quiescent Current
PFM No Load
VIN
VUVLO
Iq
2.7 − 5.5 V
2.3 2.5 2.6 V
− 30 45 mA
Standby Current, EN Low
Istb − 0.3 1.2 mA
Oscillator Frequency
Peak Inductor Current
Feedback Reference Voltage
FB Pin Tolerance Overtemp @ Iout = 100 mA
Reference Voltage Line Regulation
Fosc
ILIM
Vref
VFBtol
DVFB
1.3 1.5 1.8 MHz
− 1200 − mA
− 0.6 − V
−3.0
−
3.0 %
− 0.1 − %
Output Voltage Accuracy @ Iout = 100 mA (Note 5)
Minimum Output Voltage
Maximum Output Voltage
Output Voltage Line Regulation (Vin = 2.7–5.5)
Io = 100 mA
VOUT
VOUT
VOUT
DVOUT
−3%
−
−
−
Vnom
0.9
3.3
0.1
+3%
−
−
−
V
V
V
%
Voltage Load Regulation
(IO = 100 mA to 300 mA)
(IO = 100 mA to 600 mA)
VLOADREG
− 0.0005 − %/mA
− 0.001 − %/mA
Load Transient Response (300 mA to 600 mA Load Step, Trise 10 ms)
Duty Cycle
VOUT
−
− 50 − mV
− − 100 %
P−Ch On−Resistance
RLxH
− 300 − mW
N−Ch On−Resistance
RLxL
− 300 − mW
P−Ch Leakage Current
ILeakH
− 0.05 − mA
N−Ch Leakage Current
ILeakL
− 0.01 − mA
Enable Pin High
VENH 1.2 −
−V
Enable Pin Low
VENL
− − 0.4 V
EN << H >> Input Current, EN = 3.6 V
IENH
− 2.0 − mA
Soft−Start Time
Tstart
Thermal Shutdown Threshold
TSD
Thermal Shutdown Hysteresis
TSDH
5. The overall output voltage tolerance depends upon the accuracy of the external resistor (R1, R2).
−
−
−
350 500 ms
160 − °C
25 − °C
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4
4페이지 NCP1521
2.0
1.5
1.0 IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 19. Output Voltage Accuracy
(VOUT = 0.9 V)
2.0
1.5
1.0
IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
150 −50
0
50 100
TEMPERATURE (°C)
Figure 20. Output Voltage Accuracy
(VOUT = 1.8 V)
150
2.0
1.5
1.0
0.5
0.0
−0.5
IOUT = 100 mA
IOUT = 300 mA
IOUT = 600 mA
−1.0
−1.5
VIN = 4.0 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 21. Output Voltage Accuracy
(VOUT = 3.3 V)
150
10 ms/Div
VOUT
50 mV/Div
IOUT
200 mA/Div
Figure 22. Load Transient Response in PWM
Operation (VIN = 3.6 V)
VOUT
50 mV/Div
10 ms/Div
IOUT
200 mA/Div
2.5 ms/Div
ILX
500 mA/Div
VOUT
500 mV/Div
Figure 23. Load Transient Response in PWM
Operation (VIN = 3.6 V)
Figure 24. Short Circuit Protection (VIN = 3.6 V)
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |